Enter this number in the highlighted field. Systems with large amounts of memory typically do not need large amounts of paging space. In fact, when you have a large amount of RAM, you might actually never even use any of your paging space see Listing 1. These concepts help you understand subsequent sections on monitoring, configuring, and tuning. With AIX Version 5.
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Paging Space Tips
Because the page replacement algorithm is always looking for free frames while it is doing its scanning on systems with a lot of memory, the number of frames to scan can be significant. In this case, the pages are stored on disk, and also exist in memory, but are not deleted from the disk so that if the page has to be written out again but with no changesthere is no performance hit. The freelist is also lower than it should be. Adding additional space that you won't use just wastes disk space and can in some cases have a negative impact on performance as the OS tries to cope with the paging space.
RULES OF THUMB FOR PAGING SPACE
If the shortage continues, free paging space blocks can fall below a second threshold known as the paging space kill level. Like pagein scrubbing, the operation is configured by vmo. AIX 7, through tight integration of the kernel and VMM, makes use of a methodology called demand paging.